Improvement in slate-frames



PATENT OTETGEo JOHN W. SAYRE, OF MARTINS CREEK, PENNSYLVANIA.

IMPROVEMENT IN SLATE'l-RAMES.

Specification forming part of Letters Patent No.

180,070, dated July 18,1876; applicationhfiled December 11, 1875.

. Slate-Frame Corners, 01" which the following is a specication Theobject otl my invention is to so secure the frames ot school-slatestogether at the corners as to insure additional strength; and thisobject I attain in the manner which I will now proceed to describe,reference being had to the accompanying drawing, in which- Figure l is asection yl view, and Fig. 2 a perspective view, of a corner otl aslate-frame strengthened according to my invention.

A and A are portions ot two bars of a slate frame, the former beingmortised to receive a tenou on the latter, and the two being gluedtogether, as in ordinary slatet'ranies. In or,- der to strengthen thisjoint I use the wire shown in the drawing, the straight central portionof this wire from Aat to y passing diagonally througha hole made in thecorner of the' frame.

At the point y the wire is bent, and from the bend pursues a straightcourse in a recess formed in the outer edge ot' the bar A, into whichthe bent end a ofthe wire is driven, as shown. In like manner the wirefrom its bent end :o is adapted to a groove in the edge of the bar A,and its bent end a. driven into the saine, the wire being thus in thebest position for resisting any tendency of the bars to part at thejoint, and the wire being so bent that -it cannot be displaced by anyordinary strains to which the frame may be subjected.

I claim as my invention- The within-described slateframe fastening,consisting ot' a wire passeddiagonally through the corner of a frame,and having its ends bent inward and sunk into the'adjoining bars, allsubstantially as described.

In testimony whereotI I have signed my naine to this specication in thepresence of two subscribing witnesses.

. JOHN W. SAYRE.y

Witnesses:

JOHN J. MILLER, R. C. MERRILL.

